US20170371224A1 - Electrically controlled interference color filter and the use thereof - Google Patents

Electrically controlled interference color filter and the use thereof Download PDF

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Publication number
US20170371224A1
US20170371224A1 US15/540,097 US201515540097A US2017371224A1 US 20170371224 A1 US20170371224 A1 US 20170371224A1 US 201515540097 A US201515540097 A US 201515540097A US 2017371224 A1 US2017371224 A1 US 2017371224A1
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colour filter
layer
interference colour
liquid crystal
filter according
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Arno Seeboth
Detlef Lötzsch
Christian Rabe
Peter Frach
Matthias Gittner
Hagen Bartzsch
René de la Barré
Roland Bartmann
Michael Vergöhl
Stefan Bruns
Thomas Neubert
Johanna Fischer
Gerhard Schottner
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/29358—Multiple beam interferometer external to a light guide, e.g. Fabry-Pérot, etalon, VIPA plate, OTDL plate, continuous interferometer, parallel plate resonator
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/216—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference using liquid crystals, e.g. liquid crystal Fabry-Perot filters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/22—Esters containing halogen
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13478—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells based on selective reflection
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • G02F2001/13478—

Definitions

  • the invention relates to an electrically controllable interference colour filter which has at least two transparent electrodes, at least one nematic liquid crystal layer and also orientation layers for orientation of the liquid crystals.
  • colour filters In general, there are two types of colour filters: interference- and absorption filters. Electrically controllable colour filters are based exclusively on the interference principle. The mode of operation and optical characteristics of the already known types of interference colour filter differ however significantly in part. Electrically controllable colour filters based on the Lyot principle are commercially available under the name “VariSpec filter” by the company LOT.
  • a Lyot filter consists of a layer structure of a birefringent material and a subsequent polarisation filter. Provided the radiated light is not already polarised linearly, an additional polarisation filter precedes it.
  • Single-stage Lyot filters are neither practicable nor commercially available. The more Lyot filters which are connected in succession, the greater the free spectral range becomes.
  • liquid crystal cells are used as electrically controllable birefringent materials and typically 12 or more Lyot filters are connected in succession to form a filter stack.
  • the complex method of construction and long switching times are further disadvantages of the “VariSpec filter”.
  • an electrically controllable colour modulation filter is described, which comprises a ferroelectric liquid crystal material with a chiral smectic C-phase.
  • colour modulation filter By reorientation of the ferroelectric liquid crystal in the electrical field, in fact the transmission of the described colour modulation filter changes in the visible spectral range, sensitive to the wavelength, without however achieving effective blocking at a specific wavelength.
  • Colour filters based on helical cholesteric LC arrangements as are described for example in US 2003/0075721 A1 or US 2008/0030635 A1, and all mechanically controllable colour filters, as described for example in U.S. Pat. No. 3,693,115, are not practicable for moving images.
  • an electrically controllable interference colour filter which has at least two transparent electrodes, at least one orientation layer and also a nematic liquid crystal layer is provided.
  • the nematic liquid crystal layer and the at least one orientation layer are in direct contact in order to enable orientation of the liquid crystals.
  • the nematic liquid crystal layer preferably has a layer thickness in the range of 100 nm to 1,000 nm, in particular of 500 to 900 nm.
  • the spacing between two adjacent resonance lines of the interference colour filter is thereby inversely proportional to the layer thickness of the nematic liquid crystal layer and of the at least one orientation layer. In order to achieve a sufficiently wide free spectral range between two resonance lines in the visible range, this layer thickness must necessarily be less than 2 ⁇ /n.
  • the orientation layer is preferably monomolecular.
  • the spacing between the dielectric reflective layers ( 103 ), which is composed of the thicknesses of the liquid crystal layer ( 106 ) and the orientation layer(s) ( 105 ), must, corresponding to optical laws (C. K. Madsen and J. H. Zhao, Optical Filter Design and Analysis, John Wiley & Sons, Inc.
  • the orientation layer is preferably bonded chemically covalently to the adjacent solid body surface, as is described for non-monomolecular orientation layers already in U.S. Pat. No. 4,842,375.
  • a chemical surface fixing represents an additional requirement.
  • SiO 2 , Ta 2 O 5 , Nb 2 O 5 or TiO 2 chemically active functional groups F, such as O—, COO—, NH 2 —, SiX 4 —, Si(OX) 4 — or SiXn(OX) 4 -n group (X ⁇ H, CH 3 , C 2 H 5 , halogen, such as F, Cl, Br, I) are absolutely necessary, on the one hand, which groups can react e.g. with the Si—O—Si or Ti—O—Ti groupings in the reflective layer to form covalent bonds, as described in detail in H. H.
  • Suitable basic structures for the orientation layer are compounds with photoreactive ethene groups, such as coumar-, phenylacryl-, 3-(2-furyl)acryl-, 3-(2-thienyl)acryl- and trans-stilbene derivatives, as shown in FIG. 2 a, in which Ar stands for phenyl, naphthyl, anthryl, furyl, thienyl or any other aromatic.
  • this basic structure requires in addition further additional functional groups F which are coupled via spacer S either to the aromatic core, as in FIG. 2 b, or to any point of the aliphatic part of the main molecule, as for example in FIG. 2 c. It is evident that the spacer in FIG.
  • FIGS. 2 a -2 e can also be bonded alternatively at other places, e.g. as in FIG. 2 d.
  • all possible further combinations can be used for the molecule design, such as for example a coupling both to the aliphatic and to the aromatic molecule part, as shown in FIG. 2 e.
  • the substituents denoted in FIGS. 2 a -2 e as R1, R2, R3, R4 stand for example for hydrogen, halogen (F, Cl, Br, I), alkyl, alkyloxy, cycloalkyl, phenyl, naphthyl, anthryl, furyl, thienyl or any other aromatic.
  • the spacer S is preferably a hydrocarbon chain with 2-8 carbon atoms, which can be interrupted for example by means of amide-, ether- or ester bridges.
  • the functional group F is preferably a O—, COO—, NH2—, SiX4—, Si(OX)4— or SiXn(OX)4-n group (X ⁇ H, CH3, C2H5, halogen such as F, Cl, Br, I).
  • Each substituent R1, R2, R3, R4 can occur either only per se or in any combination between R1, R2, R3, R4.
  • the nematic liquid crystal layer is in direct contact at both surfaces with respectively one orientation layer.
  • the interference colour filter has a distance layer which has at least one recess which receives the nematic liquid crystal layer.
  • the layer thickness of the nematic liquid crystal layer can be adjusted via the distance layer.
  • the distance layer is thereby preferably produced in the sputtering process, as a result of which the layer thickness of the distance layer can be adjusted with precision in the single-digit nm range.
  • a further preferred embodiment provides that the interference colour filter has at least one dielectric reflective layer.
  • the dielectric reflective layer consists preferably of alternate pairs of layers of a low-refractive and a high-refractive material, n being a whole positive number.
  • a low-refractive material e.g. SiO 2 with a refractive index of 1.46 at 589 nm
  • high-refractive material Ta 2 O 5 , Nb 2 O 5 or TiO 2 with refractive indices between 2.15 and 2.45 at 589 nm can be used. Selection of the mentioned dielectric materials is optimised for the visible spectral range.
  • the dielectric reflective layer can be disposed on the side of the transparent electrode which is orientated towards the nematic liquid crystal layer.
  • a second variant provides that the dielectric reflective layer is disposed on the side of the transparent electrode which is orientated away from the nematic liquid crystal layer and a third variant relates to integration of the transparent electrodes in the dielectric reflective layers.
  • the transparent electrodes comprise a transparent electrically conductive material or consist hereof.
  • ITO indium-tin oxide
  • AZO aluminium-doped zinc oxide
  • FTO fluorine-tin oxide
  • ATO antimony-tin oxide
  • graphene silver nanowires and carbon nanotubes.
  • FIG. 1 shows the schematic construction of an interference colour filter according to the invention.
  • FIG. 2 shows various structures for components used according to the invention for the orientation layer.
  • FIG. 3 shows, with reference to a diagram, the displacement of the transmission range of an interference colour filter according to the invention in a spectral range not used for light transmission.
  • an interference colour filter according to the invention which filter has two orientation layers ( 105 ) and ( 105 ′), between which a nematic liquid crystal layer ( 106 ) is disposed.
  • the thickness of the nematic liquid crystal layer ( 106 ) is thereby defined by the surrounding distance layer ( 104 ).
  • the dielectric reflective layers ( 103 ) and ( 103 ′) are respectively disposed.
  • the transparent electrodes ( 102 ) and ( 102 ′) are deposited.
  • the interference colour filter according to the invention also has outer carrier layers ( 101 ) and ( 101 ′).
  • Example 1 relates to an electrically controllable interference colour filter designed for green light with a wavelength of 575 nm.
  • ITO glasses of the company recuperzisions Glas & Optik GmbH were used with a surface resistance of 40 ⁇ / ⁇ .
  • the transmission of the ITO glass is 80% at 450 nm and 87% at 700 nm.
  • Two of these ITO glasses are coated respectively with a dielectric reflective layer ( 103 ) which is designed for a wavelength of 575 nm.
  • the dielectric reflective layer consists of four SiO 2 — and four Ta 2 O 5 layers which are sputtered on in an alternate layer sequence starting with SiO 2 (S[HL] ⁇ 4 H-575 nm).
  • trans-3-(3-(5-chloropentyloxy)phenyl)acrylic acid phenyl ester is subsequently bonded, in the immersion process, covalently to the reflective layer surface, as a result of which a monomolecular organic layer with photoreactive ethene groups is formed.
  • the structured surface of the orientation layer ( 105 ) is produced therefrom.
  • Elipsometric measurements show that the thickness of the orientation layer, as to be expected for a monomolecular layer, is below the detection limit of 2 nm, as a condition of the process.
  • the distance layer ( 104 ) is applied in the form of two webs on opposite ends of the substrate. A recess is thereby produced in the centre of the substrate and, after assembly of the two half-cells (ITO glass+reflective layer+orientation layer/ITO glass+reflective layer+distance layer), forms the cavity into which the liquid crystal layer ( 106 ) is filled.
  • the distance layer is produced in the sputtering process, the cavity surface being covered by a mask.
  • SiO 2 was sputtered on with a layer thickness of 753 nm.
  • a LC layer is produced with analogously 753 nm.
  • Both half-cells (ITO glass+reflective layer+orientation layer/ITO glass+reflective layer+distance layer) are joined, plane-parallel, according to a conventional LCD-assembly technique, to form the interference filter.
  • the cavity of the interference filter is filled with a nematic liquid crystal in the last step.
  • the thus produced colour filter can be connected to the ITO electrodes thereof by applying a voltage of 11 V.
  • the colour filter In the “off” state, the colour filter is transparent for light of wavelength 575 nm, whereas, in the “on” state, the backlight is blocked practically completely.
  • the transmission wavelength in the “on” state is in the unused spectral range.
  • the transmission spectra of the colour filter in the “off” and “on” state for the wavelength range of 520 nm to 600 nm are shown in image 3 . These spectra were measured with nonpolarised light.
  • the colour filter In the “off” state, the colour filter has, in the observed wavelength range, two transmission peaks with maxima at 545 nm and 575 nm. The range therebetween is defined as free spectral range. As a function of the applied voltage, the peak is displaced continuously from 575 nm to 545 nm.
  • Example 2 is an electrically controllable interference colour filter designed for blue light with a wavelength of 450 nm.
  • Embodiment 2 was produced analogously to embodiment 1.
  • the thickness of the SiO 2 and Ta 2 O 5 layers of the reflective layer ( 103 ) was changed to 76.36 nm (SiO 2 )/51.07 nm (Ta 2 O 5 ) and secondly the thickness of the spacer layer to 558 nm.
  • the thus produced colour filter switches at a voltage of 9.2 V at the ITO electrodes thereof.
  • With a monochromatic backlight the colour filter switches from blue to black.
  • the switching effect is clearly visible with the naked eye.
  • Example 3 is an electrically controllable interference colour filter designed for red light with a wavelength of 632 nm.
  • Embodiment 3 was likewise produced analogously to embodiment 1 with adaptation of the thickness of the SiO 2 and Ta 2 O 5 layers to 95.53 nm (SiO 2 )/64.12 (Ta 2 O 5 ) of the reflective layer and of the thickness of the spacer layer to 798 nm.
  • the thus produced colour filter switches at a voltage of 11.9 V at the ITO electrodes thereof.
  • With a monochromatic backlight the colour filter switches from red to black.
  • the switching effect is clearly visible with the naked eye.
  • the switching time and threshold voltage of the electrically controllable filter can be displaced both to higher and to lower values. It is likewise evident that the maximum displacement range of the wavelength is determined by ⁇ n and the used displacement range can be controlled variably via the voltage.
  • the embodiments can be used as single filter or as RGB filter, also in matrix form.

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DE102015200488.0 2015-01-14
DE102015200488.0A DE102015200488A1 (de) 2015-01-14 2015-01-14 Elektrisch steuerbarer Interferenzfarbfilter und dessen Verwendung
PCT/EP2015/079512 WO2016113051A1 (de) 2015-01-14 2015-12-13 Elektrisch steuerbarer interferenzfarbfilter und dessen verwendung

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JP (1) JP2018501523A (ja)
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US10418550B2 (en) * 2018-05-29 2019-09-17 Nanjing University High temperature resistant memristor based on two-dimensional covalent crystal and preparation method thereof
US11815763B1 (en) 2022-12-22 2023-11-14 Shanxi University Liquid crystal coherent transparent display screen and liquid crystal-laser transparent display system

Citations (1)

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US20070024970A1 (en) * 2003-11-06 2007-02-01 Johan Lub Dichroic guest-host polarizer comprising an oriented polymer film

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KR20170102546A (ko) 2017-09-11
EP3245559B1 (de) 2020-06-10
DE102015200488A1 (de) 2016-07-14
CN107257941A (zh) 2017-10-17
EP3245559A1 (de) 2017-11-22
WO2016113051A1 (de) 2016-07-21

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